/* Design System Contract reference site. Knapsack Brand 2.0 tokens. */

:root {
  /* Primary */
  --primary-deep:   #3C1E83;
  --primary-dark:   #4E29AD;
  --primary-base:   #6B35E9;
  --primary-soft:   #7E55EF;
  --primary-bright: #A98DF6;
  --primary-pale:   #D4C5FE;

  /* Secondary: Yellow (used for warning callouts and review tags) */
  --secondary-yellow-deep:   #654001;
  --secondary-yellow-base:   #FEA814;
  --secondary-yellow-bright: #FFD58D;
  --secondary-yellow-pale:   #FFF3DD;

  /* Neutrals */
  --neutral-black:              #000000;
  --neutral-white:              #ffffff;
  --neutral-deep:               #19181B;
  --neutral-gray:               #373737;
  --neutral-purple-gray:        #7B708C;
  --neutral-bright-purple-gray: #B7B1BF;
  --neutral-pale-gray:          #EBE9ED;

  /* Site-level roles */
  --font-sans: 'Golos Text', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, Consolas, monospace;
  --sidebar-width: 256px;
  --content-max: 820px;
  --radius: 8px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: auto; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  font-weight: 400;
  color: var(--neutral-deep);
  background: var(--neutral-white);
}

/* ---------- Header ---------- */

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--neutral-pale-gray);
}

.brand {
  display: inline-flex;
  align-items: center;
  line-height: 0;
}

.logo {
  height: 18px;
  width: auto; /* required: the source SVG carries width="491" */
  display: block;
}

.site-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--neutral-deep);
  text-decoration: none;
  padding-left: 16px;
  border-left: 1px solid var(--neutral-bright-purple-gray);
}

.site-title:hover { color: var(--primary-base); }

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--primary-deep);
  background: var(--primary-pale);
  white-space: nowrap;
}

.header-jump {
  margin-left: auto;
  font-size: 14px;
  display: none;
}

/* ---------- Layout ---------- */

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  grid-template-areas: "nav main";
  gap: 48px;
  max-width: calc(var(--sidebar-width) + var(--content-max) + 48px + 48px);
  margin: 0 auto;
  padding: 32px 24px 64px;
}

main { grid-area: main; min-width: 0; }

.sidebar {
  grid-area: nav;
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  font-size: 14px;
  padding-right: 8px;
}

.sidebar h2 {
  font-size: 12px;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--neutral-purple-gray);
  margin: 0 0 8px;
}

.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { margin: 0; }

.sidebar a {
  display: block;
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--neutral-gray);
  text-decoration: none;
}

.sidebar a:hover { background: var(--neutral-pale-gray); color: var(--neutral-deep); }

.sidebar a[aria-current="page"] {
  color: var(--primary-deep);
  background: var(--primary-pale);
  font-weight: 500;
}

.sidebar .subnav {
  margin: 4px 0 8px 12px;
  padding-left: 8px;
  border-left: 1px solid var(--neutral-pale-gray);
}

.sidebar .subnav a {
  padding: 3px 8px;
  font-size: 13px;
  color: var(--neutral-purple-gray);
}

.sidebar .subnav a:hover { color: var(--neutral-deep); }

.sidebar code { font-size: 12px; background: none; padding: 0; }

/* ---------- Type ---------- */

h1, h2, h3, h4 {
  font-weight: 500;
  line-height: 1.2;
  color: var(--neutral-deep);
  scroll-margin-top: 24px;
}

h1 {
  font-size: 40px;
  letter-spacing: -0.02em;
  color: var(--primary-base);
  margin: 0 0 16px;
}

h2 {
  font-size: 28px;
  margin: 56px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--neutral-pale-gray);
}

h3 { font-size: 22px; margin: 40px 0 12px; }
h4 { font-size: 18px; margin: 24px 0 8px; }

main > h2:first-of-type { margin-top: 40px; }

p, ul, ol, dl, table, pre, .callout { margin: 0 0 16px; }

.lede {
  font-size: 20px;
  line-height: 1.4;
  color: var(--neutral-gray);
  margin-bottom: 24px;
}

a { color: var(--primary-base); text-underline-offset: 2px; }
a:hover { color: var(--primary-dark); }

a:focus-visible, summary:focus-visible {
  outline: 2px solid var(--primary-base);
  outline-offset: 2px;
  border-radius: 4px;
}

ul, ol { padding-left: 24px; }
li { margin-bottom: 6px; }
li > ul, li > ol { margin-top: 6px; margin-bottom: 0; }

strong { font-weight: 500; }

/* ---------- Code ---------- */

code, pre, kbd, samp { font-family: var(--font-mono); }

code {
  font-size: 0.875em;
  background: var(--neutral-pale-gray);
  padding: 1px 5px;
  border-radius: 4px;
  overflow-wrap: anywhere;
}

pre {
  font-size: 14px;
  line-height: 1.55;
  background: var(--neutral-pale-gray);
  border: 1px solid var(--neutral-bright-purple-gray);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
  font-size: inherit;
  overflow-wrap: normal;
  white-space: pre;
}

.code-label {
  display: block;
  font-size: 12px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--neutral-purple-gray);
  margin: 0 0 6px;
}

/* ---------- Tables ---------- */

.table-wrap { overflow-x: auto; margin: 0 0 16px; }
.table-wrap table { margin: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

th, td {
  text-align: left;
  vertical-align: top;
  padding: 10px 12px;
  border-bottom: 1px solid var(--neutral-pale-gray);
}

th {
  font-weight: 500;
  color: var(--neutral-deep);
  border-bottom: 2px solid var(--neutral-bright-purple-gray);
  white-space: nowrap;
}

tbody tr:nth-child(even) td { background: #F6F5F7; background: color-mix(in srgb, var(--neutral-pale-gray) 45%, white); }

/* ---------- Field entries ---------- */

.field {
  margin: 32px 0;
  padding: 20px 24px 8px;
  border: 1px solid var(--neutral-pale-gray);
  border-radius: var(--radius);
  scroll-margin-top: 24px;
}

.field:target { border-color: var(--primary-base); box-shadow: 0 0 0 2px var(--primary-pale); }

.field > h3, .field > h4 {
  margin: 0 0 12px;
  font-size: 20px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.field > h3 code, .field > h4 code {
  font-size: 18px;
  font-weight: 500;
  background: none;
  padding: 0;
  color: var(--primary-deep);
}

.anchor {
  font-size: 14px;
  font-weight: 400;
  color: var(--neutral-bright-purple-gray);
  text-decoration: none;
}

.anchor:hover { color: var(--primary-base); }

.field-meta {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 6px 16px;
  font-size: 15px;
  padding: 12px 16px;
  background: #F6F5F7;
  background: color-mix(in srgb, var(--neutral-pale-gray) 45%, white);
  border-radius: 6px;
}

.field-meta dt { font-weight: 500; color: var(--neutral-gray); }
.field-meta dd { margin: 0; min-width: 0; }

.req {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
  padding: 4px 8px;
  border-radius: 999px;
  vertical-align: middle;
}

.req--yes { background: var(--primary-base); color: var(--neutral-white); }
.req--no  { background: var(--neutral-pale-gray); color: var(--neutral-gray); }
.req--cond { background: var(--primary-pale); color: var(--primary-deep); }

.related { font-size: 14px; color: var(--neutral-purple-gray); }

td.same { color: var(--neutral-purple-gray); font-size: 13px; }

/* ---------- Callouts ---------- */

.callout {
  padding: 16px 20px;
  border-radius: var(--radius);
  border-left: 4px solid var(--primary-base);
  background: #F4F0FE;
  background: color-mix(in srgb, var(--primary-pale) 30%, white);
}

.callout > :last-child { margin-bottom: 0; }

.callout-title {
  display: block;
  font-weight: 500;
  margin-bottom: 6px;
}

.callout--warning {
  border-left-color: var(--secondary-yellow-base);
  background: var(--secondary-yellow-pale);
}

.callout--warning .callout-title { color: var(--secondary-yellow-deep); }

.verify {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--secondary-yellow-bright);
  color: var(--secondary-yellow-deep);
}

/* ---------- Index page ---------- */

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
}

.topic-grid li { margin: 0; }

.topic-grid a {
  display: block;
  height: 100%;
  padding: 18px 20px;
  border: 1px solid var(--neutral-pale-gray);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--neutral-deep);
}

.topic-grid a:hover { border-color: var(--primary-base); color: var(--neutral-deep); }

.topic-grid .topic-name {
  display: block;
  font-size: 18px;
  font-weight: 500;
  color: var(--primary-base);
  margin-bottom: 4px;
}

.topic-grid .topic-desc { display: block; font-size: 15px; color: var(--neutral-gray); }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--neutral-pale-gray);
  padding: 24px;
  font-size: 14px;
  color: var(--neutral-purple-gray);
  text-align: center;
}

/* ---------- Responsive ---------- */

@media (max-width: 896px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "main" "nav";
    gap: 32px;
    padding: 24px 16px 48px;
  }

  .sidebar {
    position: static;
    max-height: none;
    overflow: visible;
    padding: 24px 0 0;
    border-top: 1px solid var(--neutral-pale-gray);
  }

  .header-jump { display: inline; }

  h1 { font-size: 32px; }
  h2 { font-size: 24px; margin-top: 40px; }
  h3 { font-size: 20px; }
  .lede { font-size: 18px; }
}

@media (max-width: 640px) {
  .site-header { padding: 12px 16px; }
  .site-title { font-size: 16px; padding-left: 12px; }
  .field { padding: 16px 16px 4px; }
  .field-meta { grid-template-columns: minmax(0, 1fr); gap: 2px 0; }
  .field-meta dd { margin-bottom: 8px; }
  pre { font-size: 13px; padding: 12px 14px; }
  table { font-size: 14px; }
  th, td { padding: 8px; }
}

@media print {
  .sidebar, .header-jump { display: none; }
  .layout { display: block; }
}